<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <div @mouseleave="removeIndex" @mouseenter="enterShow">
        <h2 class="all">全部商品分类</h2>
        <transition name="sort">
          <div class="sort" v-show="show">
            <!--          时间委派+编程式路由导航-->
            <div class="all-sort-list2" @click="goSearch">
              <!--            一级分类-->
              <div class="item" v-for="(c1, index) in categoryList" :key="c1.categoryId" :class="{cur:currentIndex === index}">
                <h3 @mouseenter="changeIndex(index)">
                  <a :data-categoryName="c1.categoryName" :data-id1="c1.categoryId">{{c1.categoryName}}</a>
                </h3>
                <div class="item-list clearfix">
                  <div class="subitem" v-for="(c2, index) in c1.categoryChild" :key="c2.categoryId">
                    <dl class="fore">
                      <dt>
                        <a :data-categoryName="c2.categoryName" :data-id2="c2.categoryId">{{c2.categoryName}}</a>
                      </dt>
                      <dd>
                        <em v-for="(c3, index) in c2.categoryChild" :key="c3.categoryId">
                          <a :data-categoryName="c3.categoryName" :data-id3="c3.categoryId">{{c3.categoryName}}</a>
                        </em>
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </transition>
      </div>
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>

    </div>
  </div>
</template>

<script>
import {mapState} from "vuex";
import {debounce} from 'lodash'

export default {
  name: "TypeNav",
  data(){
    return{
      currentIndex: -1,
      show:true
    }
  },
  methods:{
    // 防抖
    changeIndex:debounce(function (index){
      this.currentIndex = index
      console.log('鼠标移入:',index)
    },50),
    // 删除索引
    removeIndex(){
      this.currentIndex = -1
      if(this.$route.path!=='/home'){
        this.show = false
      }
    },
    // 时间委派+编程式路由导航
    goSearch(event) {
    //  把全部子节点的事件委派给父节点
      let query = {}
      let params = undefined
      let targetDataset = event.target.dataset
      let {id1, id2} = targetDataset
      query['categoryName'] = targetDataset.categoryname
      if(id1){
        query['category1id'] = targetDataset.id1
      }else if(id2){
        query['category2id'] = targetDataset.id3
      }else{
        query['category3id'] = targetDataset.id3
      }
      console.log(query)
      if (this.$route.params){
        params = this.$route.params
      }
      this.$router.push({
        name:'search',
        query,
        params
      })
    },

    // 动态展示
    enterShow(){
      this.show = true
    }
  },
  mounted() {
    if(this.$route.path!=='/home'){
      this.show = false
    }
  },
  computed:{
    ...mapState({
      categoryList:state=>state.home.categoryList
    })
  }
}
</script>

<style scoped lang="less">

.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &:hover {
            .item-list {
              display: block;
            }
          }
        }
        .cur {
          background-color: blue;
        }
      }
    }
    //过渡动画
    .sort-enter {
      height: 0;
    }
    .sort-enter-to {
      height: 461px;
    }
    .sort-enter-active {
      transition: all 0.2s linear;
    }
  }
}

</style>
